Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97a887616d4ce1c…

MALICIOUS

PDF

81.8 KB Created: 2021-06-08 07:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 076208c68ba99832c20b733ce7e8dfb3 SHA-1: b205525844b4cec43cd852465e3e46fa8e924e99 SHA-256: a97a887616d4ce1c7d9edb58858d8eca5ba691a3f588f71f522ef74fe72da7ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/pbw?utm_term=how+to+make+slime+with+ultimate+slimygloop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371812/normal_600d58c82903e.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/7292935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604162bf21e89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446275/normal_5fcb047348c88.pdfIn PDF document text
    • https://donixefafara.weebly.com/uploads/1/3/4/3/134310569/3720b6.pdfIn PDF document text
    • https://sufunawad.weebly.com/uploads/1/3/7/5/137503422/6225334.pdfIn PDF document text
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/9850851.pdfIn PDF document text
    • https://jusunusimonaka.weebly.com/uploads/1/3/4/7/134717465/duwejixemaloras-valanemod.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/9452.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1650a955-4c98-4908-b716-5ddb26dc67f3/battletech_alpha_strike_quick_reference.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492d82ed-8084-4868-aaa7-bbe71c193fb5/49219891717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c624b4-cec6-405e-8afe-4b16bf27b52b/g_shock_date.pdfIn PDF document text
    • http://pukagij.pbworks.com/f/zegubodotaw.pdfIn PDF document text
    • http://kejufavo.pbworks.com/f/postleitzahlenkarte_plz_karte_deutschland_kostenlos_download.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/f/divisiones_con_dos_cifras_afuera_y_tres_adentro.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/89863729680.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144783765/how_to_cheat_on_edgenuity_exam.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/anestesia_local_en_odontologa_macouzet.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144751320/73282125886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7313b6f-a85d-4c95-acde-447c9115b3a1/legogiwuwidivusinela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8528a3-f814-4aa9-9a67-c676f6017525/tinitaw.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/solucionario_libro_formacion_y_orientacion_laboral_mc_graw_hill.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/how_to_make_a_fake_plane_ticket_as_a_gift.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 5132 bytes
SHA-256: b9880343d4104afc3fcb57ca3d0e1507aa39b2ddcc261d54fac0bbe32b24367d
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 11156 bytes
SHA-256: 9f11cffe829854963972296fbcd0ebad21ff9ca12ec8c9e141340418ffeebf21
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378